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Hanli WU, Hua ZHAO, Jenny LIU, Zhentao HU
《结构与土木工程前沿(英文)》 2020年 第14卷 第5期 页码 1232-1246 doi: 10.1007/s11709-020-0653-0
关键词: bridge weigh-in-motion continuous bridge fast Fourier transform influence line axle weight calculation
《结构与土木工程前沿(英文)》 2021年 第15卷 第4期 页码 877-894 doi: 10.1007/s11709-021-0756-2
关键词: bridges multi-lane factor traffic load lane load disparity multi-truck presence weigh-in-motion data
张雄文,任回兴
《中国工程科学》 2010年 第12卷 第2期 页码 22-26
苏通大桥是我国在长江河口地区建设的世界首座跨径超千米的斜拉桥,主塔基础位于深水潮汐急流河段,采用钻孔灌注桩群桩基础,是规模最大的群桩基础。对于深水急流条件下的群桩基础,为承台提供施工条件的钢吊箱的高精度施工是一个关键难题。从沉放方案选择、结构方案设计、制作和安装、整体沉放工艺、同步性控制及定位等方面阐述了苏通大桥主塔基础5 800 t钢吊箱的整体沉放技术与工艺。其中,将钻孔桩施工平台与钢吊箱底板结合的结构方案和钢吊箱整体沉放工艺、同步性控制和定位技术具有明显的创新性。
韩磊,彭天波,赵艺
《中国工程科学》 2012年 第14卷 第5期 页码 51-56
建立了3种基础-土相互作用模拟方式,分别为考虑一定桩身柔性的固结独塔模型,基于“m”法的线性独塔模型,以及采用“p-y”曲线法的非线性独塔模型。采用El-Centro和Kobe两种地震波分别对3个模型进行计算分析,结果发现,基于“m”法的线性独塔沉井模型与“p-y”曲线法的非线性独塔沉井模型相比响应偏大,而基于“m”法的线性独塔群桩基础模型则与“p-y”曲线法的非线性独塔群桩基础模型有较好的吻合。
Offline motion planning and simulation of two-robot welding coordination
Tie ZHANG, Fan OUYANG
《机械工程前沿(英文)》 2012年 第7卷 第1期 页码 81-92 doi: 10.1007/s11465-012-0309-4
This paper focuses on the two-robot welding coordination of complex curve seam which means one robot grasp the workpiece, the other hold the torch, the two robots work on the same workpiece simultaneously. This paper builds the dual-robot coordinate system at the beginning, and three point calibration method of two robots’ relative base coordinate system is presented. After that, the non master/slave scheme is chosen for the motion planning, the non master/slave scheme sets the poses versus time function of the point u on the workpiece, and calculates the two robot end effecter trajectories through the constrained relationship matrix automatically. Moreover, downhand welding is employed which can guarantee the torch and the seam keep in good contact condition all the time during the welding. Finally, a Solidworks-SimMechanics simulation platform is established, and a simulation of curved steel pipe welding is conducted. The results of the simulation illustrate the welding process can meet the requirements of downhand welding, the joint displacement curves are smooth and continuous and no joint velocities are out of working scope.
关键词: complex curve seam two robots coordinated welding motion planning
Synthesis of Intermittent-Motion Linkages with Slight Difference in Length Between Links
CHEN Xin-bo, YU Zhen
《机械工程前沿(英文)》 2006年 第1卷 第1期 页码 76-79 doi: 10.1007/s11465-005-0007-6
The design of intermittent-motion linkages using traditional methods is usually complicated. In this paper, (1) a new method for realizing intermittent motion, using linkages with a slight difference in length between links, is studied; (2) some new types of intermittent-motion linkages and their software for visual analysis and design are developed; and (3) influences of some design parameters on intermittent-motion characteristics are clarified. Results confirmed that the theory and the software are useful, making the synthesis of intermittent-motion linkages clear and easy.
关键词: synthesis useful intermittent intermittent-motion traditional
Design and modeling of continuum robot based on virtual-center of motion mechanism
《机械工程前沿(英文)》 2023年 第18卷 第2期 doi: 10.1007/s11465-022-0739-6
关键词: VCM mechanism continuum robot flexural joint pseudo-rigid body model cable-driven
Measurement and analysis of typical motion error traces from a circular test
LI Xiaoli, LIU Huanlao
《机械工程前沿(英文)》 2008年 第3卷 第2期 页码 146-150 doi: 10.1007/s11465-008-0033-2
关键词: machine compensation direction combination desired efficient
Rini NISHANTH, Andrew WHYTE, V. John KURIAN
《工程管理前沿(英文)》 2018年 第5卷 第3期 页码 357-368 doi: 10.15302/J-FEM-2018022
Floating production storage and offloading (FPSO) units increasingly represent a practical and economic means for deep-water oil extraction and production. Systems thinking gives a unique opportunity to seek a balance between FPSO technical performance(s), with whole-cost; stakeholder decision-making is charged to align different fit-for-use design specification options’ that address technical-motion(s), with respective life-cycle cost analyses (LCCA). Soft system methodology allows situation based analyses over set periods-of-time by diagnosing the problem-at-hand; namely, assessing the antecedents of life-cycle cost relative to FPSO sub-component design alternatives. Alternative mooring- component comparisons for either new-build hulls or refurbished hulls represent an initial necessary consideration to facilitate extraction, production and storage of deep-water oil reserves. Coupled dynamic analysis has been performed to generate FPSO motion in six degrees of freedom using SESAM DeepC, while life-cycle cost analysis (LCAA) studies give net-present-value comparisons reflective of market conditions. A parametric study has been conducted by varying wave heights from 4 – 8 m to understand FPSO motion behavior in the presence of wind and current, as well as comparing the motions of turreted versus spread mooring design alternatives. LCCA data has been generated to compare the cost of such different mooring options/hull conditions over 10 and 25-year periods. Systems thinking has been used to explain the interaction of problem variables; resultantly this paper is able to identify explicit factors affecting the choice of FPSO configurations in terms of motion and whole-cost, toward assisting significantly with the front-end engineering design (FEED) phase of fit-for-purpose configured FPSOs, in waters off Malaysia and Australia.
关键词: FPSO LCCA spread/turret-mooring DeepC cost motion soft-systems
Novel probabilistic rolling regular tetrahedron mechanism
Yonghan GUAN, Yan’an YAO, Chao LIU, Ruiming LI
《机械工程前沿(英文)》 2021年 第16卷 第2期 页码 363-378 doi: 10.1007/s11465-020-0628-9
关键词: mobile mechanism probabilistic motion rolling mechanism stochastic motion
Features of seismic hazard in large dam projects and strong motion monitoring of large dams
Martin WIELAND,
《结构与土木工程前沿(英文)》 2010年 第4卷 第1期 页码 56-64 doi: 10.1007/s11709-010-0005-6
关键词: seismic hazard arch dam concrete face rockfill dam strong motion instrumentation reservoir-triggered seismicity Wenchuan earthquake
Major bridge development in Hong Kong, China—past, present and future
Michael CH HUI, Doris YAU
《结构与土木工程前沿(英文)》 2011年 第5卷 第4期 页码 405-414 doi: 10.1007/s11709-011-0136-4
关键词: Tsing Ma Bridge Kap Shui Mun Bridge Ting Kau Bridge Stonecutters Bridge Hong Kong-Zhuhai-Macao Bridge wind and structural health monitoring system (WASHMS)
Fugui XIE,Xin-Jun LIU
《机械工程前沿(英文)》 2016年 第11卷 第2期 页码 135-143 doi: 10.1007/s11465-016-0389-7
This study introduces a high-speed parallel robot with Schönflies motion. This robot exhibits a promising prospect in realizing high-speed pick-and-place manipulation for packaging production lines. The robot has four identical limbs and a single platform. Its compact structure and single-platform concept provides this robot with good dynamic response potential. A line graph method based on Grassmann line geometry is used to investigate the mobility characteristics of the proposed robot. A generalized Blanding rule is also introduced into this procedure to realize mutual conversion between the line graphs for motions and constraints. Subsequently, the inverse kinematics is derived, and the singularity issue of the robot is investigated using both qualitative and quantitative approaches. Input and output transmission singularity indices are defined based on the reciprocal product in screw theory and the virtual coefficient by considering motion/force transmission performance. Thereafter, the singular loci of the proposed robot with specific geometric parameters are derived. The mobility analysis, inverse kinematics modeling, and singularity analysis conducted in this study are helpful in developing the robot.
关键词: parallel robot mobility inverse kinematics singularity transmission performance
标题 作者 时间 类型 操作
A filtering-based bridge weigh-in-motion system on a continuous multi-girder bridge considering the influence
Hanli WU, Hua ZHAO, Jenny LIU, Zhentao HU
期刊论文
A practical multi-lane factor model of bridges based on multi-truck presence considering lane load disparities
期刊论文
Synthesis of Intermittent-Motion Linkages with Slight Difference in Length Between Links
CHEN Xin-bo, YU Zhen
期刊论文
Measurement and analysis of typical motion error traces from a circular test
LI Xiaoli, LIU Huanlao
期刊论文
Floating production storage and offloading systems’ cost and motion performance: A systems thinking application
Rini NISHANTH, Andrew WHYTE, V. John KURIAN
期刊论文
Novel probabilistic rolling regular tetrahedron mechanism
Yonghan GUAN, Yan’an YAO, Chao LIU, Ruiming LI
期刊论文
Features of seismic hazard in large dam projects and strong motion monitoring of large dams
Martin WIELAND,
期刊论文
Major bridge development in Hong Kong, China—past, present and future
Michael CH HUI, Doris YAU
期刊论文